.content {
    display: flex;
    flex-wrap: wrap;
}

.content>div {
    margin: 10px;
}


/* 太极 */
#yin-yang {
    width: 96px;
    height: 48px;
    background: #eee;
    border-color: green;
    border-style: solid;
    border-width: 2px 2px 50px 2px;
    border-radius: 100%;
    position: relative;
}

#yin-yang:before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    background: #eee;
    border: 18px solid green;
    border-radius: 100%;
    width: 12px;
    height: 12px;
}

#yin-yang:after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    background: green;
    border: 18px solid #eee;
    border-radius: 100%;
    width: 12px;
    height: 12px;
}

/* 弯尾箭头 */
#curvedarrow {
    position: relative;
    width: 0;
    height: 0;
    border-top: 9px solid transparent;
    border-right: 9px solid green;
    transform: rotate(10deg);
    -moz-transform: rotate(10deg);
    -ms-transform: rotate(10deg);
    -o-transform: rotate(10deg);
}

#curvedarrow:after {
    content: "";
    position: absolute;
    border: 0 solid transparent;
    border-top: 3px solid green;
    border-radius: 20px 0 0 0;
    top: -12px;
    left: -9px;
    width: 12px;
    height: 12px;
    transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -o-transform: rotate(45deg);
}

/* 六角星 */
#star-six {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 100px solid green;
    position: relative;
}

#star-six:after {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-top: 100px solid green;
    position: absolute;
    content: "";
    top: 30px;
    left: -50px;
}

/* 五角星 */
#star-five {
    margin: 50px 0;
    position: relative;
    display: block;
    color: green;
    width: 0px;
    height: 0px;
    border-right: 100px solid transparent;
    border-bottom: 70px solid green;
    border-left: 100px solid transparent;
    transform: rotate(35deg);
    -webkit-transform: rotate(35deg);
    -ms-transform: rotate(35deg);
    -o-transform: rotate(35deg);
}

#star-five:before {
    border-bottom: 80px solid green;
    border-left: 30px solid transparent;
    border-right: 30px solid transparent;
    position: absolute;
    height: 0;
    width: 0;
    top: -45px;
    left: -65px;
    display: block;
    content: '';
    transform: rotate(-35deg);
    -moz-transform: rotate(-35deg);
    -ms-transform: rotate(-35deg);
    -o-transform: rotate(-35deg);
}

#star-five:after {
    position: absolute;
    display: block;
    color: green;
    top: 3px;
    left: -105px;
    width: 0px;
    height: 0px;
    border-right: 100px solid transparent;
    border-bottom: 70px solid green;
    border-left: 100px solid transparent;
    transform: rotate(-70deg);
    -moz-transform: rotate(-70deg);
    -ms-transform: rotate(-70deg);
    -o-transform: rotate(-70deg);
    content: '';
}

/* 五边形 */
#pentagon {
    position: relative;
    width: 54px;
    border-width: 50px 18px 0;
    border-style: solid;
    border-color: green transparent;
}

#pentagon:before {
    content: "";
    position: absolute;
    height: 0;
    width: 0;
    top: -85px;
    left: -18px;
    border-width: 0 45px 35px;
    border-style: solid;
    border-color: transparent transparent green;
}

/* 六边形 */
#hexagon {
    width: 100px;
    height: 55px;
    background: green;
    position: relative;
}

#hexagon:before {
    content: "";
    position: absolute;
    top: -25px;
    left: 0;
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 25px solid green;
}

#hexagon:after {
    content: "";
    position: absolute;
    bottom: -25px;
    left: 0;
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-top: 25px solid green;
}

/* 八边形 */
#octagon {
    width: 98px;
    height: 100px;
    background: green;
    position: relative;
}

#octagon:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    border-bottom: 29px solid green;
    border-left: 29px solid #fff;
    border-right: 29px solid #fff;
    width: 42px;
    height: 0;
}

#octagon:after {
    content: ' ';
    position: absolute;
    bottom: 0;
    left: 0;
    border-top: 29px solid green;
    border-left: 29px solid #fff;
    border-right: 29px solid #fff;
    width: 42px;
    height: 0;
}


/* 心形 */
#heart {
    position: relative;
    width: 100px;
    height: 90px;
}

#heart:before,
#heart:after {
    position: absolute;
    content: "";
    left: 50px;
    top: 0;
    width: 50px;
    height: 80px;
    background: green;
    -moz-border-radius: 50px 50px 0 0;
    border-radius: 50px 50px 0 0;
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
    -webkit-transform-origin: 0 100%;
    -moz-transform-origin: 0 100%;
    -ms-transform-origin: 0 100%;
    -o-transform-origin: 0 100%;
    transform-origin: 0 100%;
}

#heart:after {
    left: 0;
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
    -webkit-transform-origin: 100% 100%;
    -moz-transform-origin: 100% 100%;
    -ms-transform-origin: 100% 100%;
    -o-transform-origin: 100% 100%;
    transform-origin: 100% 100%;
}


/* 无线图形 */
#infinity {
    position: relative;
    width: 212px;
    height: 100px;
}

#infinity:before,
#infinity:after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 60px;
    height: 60px;
    border: 20px solid green;
    -moz-border-radius: 50px 50px 0 50px;
    border-radius: 50px 50px 0 50px;
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
}

#infinity:after {
    left: auto;
    right: 0;
    -moz-border-radius: 50px 50px 50px 0;
    border-radius: 50px 50px 50px 0;
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
}


/* 砖石盾牌 */
#diamond-shield {
    width: 0;
    height: 0;
    border: 50px solid transparent;
    border-bottom: 20px solid green;
    position: relative;
    top: -50px;
}

#diamond-shield:after {
    content: '';
    position: absolute;
    left: -50px;
    top: 20px;
    width: 0;
    height: 0;
    border: 50px solid transparent;
    border-top: 70px solid green;
}

/* 砖石形 */

#cut-diamond {
    border-style: solid;
    border-color: transparent transparent green transparent;
    border-width: 0 25px 25px 25px;
    height: 0;
    width: 50px;
    position: relative;
    margin: 20px 0 50px 0;
}

#cut-diamond:after {
    content: "";
    position: absolute;
    top: 25px;
    left: -25px;
    width: 0;
    height: 0;
    border-style: solid;
    border-color: green transparent transparent transparent;
    border-width: 70px 50px 0 50px;
}

/* 鸡蛋 */
#egg {
    display: block;
    width: 126px;
    height: 180px;
    background-color: green;
    -webkit-border-radius: 63px 63px 63px 63px / 108px 108px 72px 72px;
    border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
}


/* 吃豆人 */
#pacman {
    width: 0px;
    height: 0px;
    border-right: 60px solid transparent;
    border-top: 60px solid green;
    border-left: 60px solid green;
    border-bottom: 60px solid green;
    border-top-left-radius: 60px;
    border-top-right-radius: 60px;
    border-bottom-left-radius: 60px;
    border-bottom-right-radius: 60px;
}

/* 聊天框 */
#talkbubble {
    width: 120px;
    height: 80px;
    background: green;
    position: relative;
    -moz-border-radius: 10px;
    -webkit-border-radius: 10px;
    border-radius: 10px;
}

#talkbubble:before {
    content: "";
    position: absolute;
    right: 100%;
    top: 26px;
    width: 0;
    height: 0;
    border-top: 13px solid transparent;
    border-right: 26px solid green;
    border-bottom: 13px solid transparent;
}

/* 爆炸形状 */
#burst-12 {
    background: green;
    width: 80px;
    height: 80px;
    position: relative;
    text-align: center;
}

#burst-12:before,
#burst-12:after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    height: 80px;
    width: 80px;
    background: green;
}

#burst-12:before {
    transform: rotate(30deg);
    -moz-transform: rotate(30deg);
    -ms-transform: rotate(30deg);
    -o-transform: rotate(30deg);
}

#burst-12:after {
    transform: rotate(60deg);
    -moz-transform: rotate(60deg);
    -ms-transform: rotate(60deg);
    -o-transform: rotate(60deg);
}

/* 徽章 */
#badge-ribbon {
    position: relative;
    background: green;
    height: 100px;
    width: 100px;
    -moz-border-radius: 50px;
    -webkit-border-radius: 50px;
    border-radius: 50px;
}

#badge-ribbon:before,
#badge-ribbon:after {
    content: '';
    position: absolute;
    border-bottom: 70px solid green;
    border-left: 40px solid transparent;
    border-right: 40px solid transparent;
    top: 70px;
    left: -10px;
    transform: rotate(-140deg);
    -moz-transform: rotate(-140deg);
    -ms-transform: rotate(-140deg);
    -o-transform: rotate(-140deg);
}

#badge-ribbon:after {
    left: auto;
    right: -10px;
    transform: rotate(140deg);
    -moz-transform: rotate(140deg);
    -ms-transform: rotate(140deg);
    -o-transform: rotate(140deg);
}

/* 电视屏幕 */
#tv {
    position: relative;
    width: 200px;
    height: 150px;
    margin: 20px 0;
    background: green;
    border-radius: 50% / 10%;
    color: white;
    text-align: center;
    text-indent: .1em;
}

#tv:before {
    content: '';
    position: absolute;
    top: 10%;
    bottom: 10%;
    right: -5%;
    left: -5%;
    background: inherit;
    border-radius: 5% / 50%;
}

/* 雪佛龙 */
#chevron {
    position: relative;
    text-align: center;
    padding: 12px;
    margin-bottom: 6px;
    height: 60px;
    width: 200px;
}

#chevron:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 51%;
    background: green;
    -webkit-transform: skew(0deg, 6deg);
    -moz-transform: skew(0deg, 6deg);
    -ms-transform: skew(0deg, 6deg);
    -o-transform: skew(0deg, 6deg);
    transform: skew(0deg, 6deg);
}

#chevron:after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    height: 100%;
    width: 50%;
    background: green;
    -webkit-transform: skew(0deg, -6deg);
    -moz-transform: skew(0deg, -6deg);
    -ms-transform: skew(0deg, -6deg);
    -o-transform: skew(0deg, -6deg);
    transform: skew(0deg, -6deg);
}

/*  放大镜 */
#magnifying-glass {
    font-size: 10em;
    /* This controls the size. */
    display: inline-block;
    width: 0.4em;
    height: 0.4em;
    border: 0.1em solid green;
    position: relative;
    border-radius: 0.35em;
}

#magnifying-glass::before {
    content: '';
    display: inline-block;
    position: absolute;
    right: -0.25em;
    bottom: -0.1em;
    border-width: 0;
    background: green;
    width: 0.35em;
    height: 0.08em;
    transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -o-transform: rotate(45deg);
}

/* Facebook图标 */
#facebook-icon {
    background: green;
    text-indent: -999em;
    width: 100px;
    height: 110px;
    border-radius: 5px;
    position: relative;
    overflow: hidden;
    border: 15px solid green;
    border-bottom: 0;
}

#facebook-icon::before {
    content: "/20";
    position: absolute;
    background: green;
    width: 40px;
    height: 90px;
    bottom: -30px;
    right: -37px;
    border: 20px solid #eee;
    border-radius: 25px;
}

#facebook-icon::after {
    content: "/20";
    position: absolute;
    width: 55px;
    top: 50px;
    height: 20px;
    background: #eee;
    right: 5px;
}


/* 十字架 */
#cross {
    background: green;
    height: 100px;
    position: relative;
    width: 20px;
}

#cross:after {
    background: green;
    content: '';
    height: 20px;
    left: -40px;
    position: absolute;
    top: 40px;
    width: 100px;
}

/* 月亮 */
#moon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    box-shadow: 15px 15px 0 0 green;
}

/* 太空入侵者 */
#space-invader {
    box-shadow:
        0 0 0 1em green,
        0 1em 0 1em green,
        -2.5em 1.5em 0 .5em green,
        2.5em 1.5em 0 .5em green,
        -3em -3em 0 0 green,
        3em -3em 0 0 green,
        -2em -2em 0 0 green,
        2em -2em 0 0 green,
        -3em -1em 0 0 green,
        -2em -1em 0 0 green,
        2em -1em 0 0 green,
        3em -1em 0 0 green,
        -4em 0 0 0 green,
        -3em 0 0 0 green,
        3em 0 0 0 green,
        4em 0 0 0 green,
        -5em 1em 0 0 green,
        -4em 1em 0 0 green,
        4em 1em 0 0 green,
        5em 1em 0 0 green,
        -5em 2em 0 0 green,
        5em 2em 0 0 green,
        -5em 3em 0 0 green,
        -3em 3em 0 0 green,
        3em 3em 0 0 green,
        5em 3em 0 0 green,
        -2em 4em 0 0 green,
        -1em 4em 0 0 green,
        1em 4em 0 0 green,
        2em 4em 0 0 green;

    background: green;
    width: 1em;
    height: 1em;
    overflow: hidden;
    margin: 50px 0 70px 65px;
}



/* 简单形状样式 */
/* 正方形 */
#square {
    width: 100px;
    height: 100px;
    background: green;
}

/* 矩形 */
#rectangle {
    width: 200px;
    height: 100px;
    background: green;
}

/* 圆形 */
#circle {
    width: 100px;
    height: 100px;
    background: green;
    -moz-border-radius: 50px;
    -webkit-border-radius: 50px;
    border-radius: 50px;
}

/* 椭圆 */
#oval {
    width: 200px;
    height: 100px;
    background: green;
    -moz-border-radius: 100px / 50px;
    -webkit-border-radius: 100px / 50px;
    border-radius: 100px / 50px;
}

/* 向上的三角形 */
#triangle-up {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 100px solid green;
}

/* 向下的三角形 */
#triangle-down {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-top: 100px solid green;
}

/* 向左的三角形 */
#triangle-left {
    width: 0;
    height: 0;
    border-top: 50px solid transparent;
    border-right: 100px solid green;
    border-bottom: 50px solid transparent;
}


/* 向右的三角形 */
#triangle-right {
    width: 0;
    height: 0;
    border-top: 50px solid transparent;
    border-left: 100px solid green;
    border-bottom: 50px solid transparent;
}

/* 左上的三角形 */
#triangle-topleft {
    width: 0;
    height: 0;
    border-top: 100px solid green;
    border-right: 100px solid transparent;
}

/* 右上的三角形 */
#triangle-topright {
    width: 0;
    height: 0;
    border-top: 100px solid green;
    border-left: 100px solid transparent;
}

/* 左下的三角形 */
#triangle-bottomleft {
    width: 0;
    height: 0;
    border-bottom: 100px solid green;
    border-right: 100px solid transparent;
}

/* 右下的三角形 */
#triangle-bottomright {
    width: 0;
    height: 0;
    border-bottom: 100px solid green;
    border-left: 100px solid transparent;
}

/* 梯形 */
#trapezoid {
    border-bottom: 100px solid green;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    height: 0;
    width: 100px;
}

/* 平行四边形 */
#parallelogram {
    width: 150px;
    height: 100px;
    transform: skew(20deg);
    -moz-transform: skew(20deg);
    -o-transform: skew(20deg);
    background: green;
}

/* 菱形 */
#diamond {
    width: 0;
    height: 0;
    border: 50px solid transparent;
    border-bottom-color: green;
    position: relative;
    top: -50px;
}

#diamond:after {
    content: '';
    position: absolute;
    left: -50px;
    top: 50px;
    width: 0;
    height: 0;
    border: 50px solid transparent;
    border-top-color: green;
}

/* 长菱形 */
#diamond-narrow {
    width: 0;
    height: 0;
    border: 50px solid transparent;
    border-bottom: 70px solid green;
    position: relative;
    top: -50px;
}

#diamond-narrow:after {
    content: '';
    position: absolute;
    left: -50px;
    top: 70px;
    width: 0;
    height: 0;
    border: 50px solid transparent;
    border-top: 70px solid green;
}